Automatic chain lock



March 30, 1937. E. P. BEAUMONT 2,075,015

AUTOMATIC CHAIN LOCK Filed Jan. 25, 1936 INVENTOR ATTORNEY Fuyme Benz/mam Y Patented Mar. 30, 1937 UNITED STATES PATENT OFFICE 3 Claims.

The present invention relates to looks, the components of which are permanently mounted on a door and its jamb, and more particularly to the type having a chain connection.

The main object of this invention is to provide a novel .and improved lock of the type mentioned, wherein upon movement of its bolt into the keeper mounted on the jamb, a chain connection is automatically effected between said door and jamb, and upon return of said bolt within its casing mounted on the door, said chain connection is automatically removed; the movement of the bolt being accomplished either by key controlled means operative from the outside surface of the door, or by manually controlled means operative from the inside surface of the door.

Another object of this invention is to provide a lock for automatically eiiecting a chain connection between a door and its 'amb, and for automatically removing such connection, by keycontrolled means operative from the outside surface of the door.

Other objects will become evident as the disclosure proceeds herein,

To accomplish these objects, I provide in an embodiment of my invention, a lock having a bolt, slidable entirely into, and partially out from a casing mounted on a door, and a keeper for receiving said bolt mounted on the jamb. A chain, with one end fixed to the jamb, has its other end removably held in a rest member which is mounted on the jamb side of the structure. An arm pivotally mounted on the casing, is associated with mechanism whereby it is swung upon movement of the bolt, either upward or downward, depending for its direction of motion upon whether the bolt is entering its keeper or the casing respectively. Upon movement of this arm, it passes the region of the rest member. When its motion is upward, it intercepts and carries the free end of the chain from off the rest member and engages said end of the chain, whereby the chain is connected between the door and jamb. When the motion of said arm is downward, the free end of the chain is adapted to be intercepted by the rest member and released frorn its engagement from said arm.

This invention is capable of numerous forms and various applications without departing from the essential features herein disclosed. It is therefore intended and desired that the embodiment shown herein be deemed illustrative and not restrictive, and that the patent shall cover whatever features of patentable novelty exist in the invention disclosed; reference being had to the appended claims rather than to the specific description herein to. indicate the scope of the invention.

In the drawing, forming part of this application, similar characters of reference indicate corresponding parts in all the views.

Fig. 1 shows a lock embodying the teachings of my present invention, in fully locked condition.

Fig. 2 is a fragmentary view of same, showing the arm at the region of the rest member; being a position it passes upon the closing and the opening of the lock.

Fig. 3 shows a top view with respect to the illustration of Fig. 2.

Fig. 4 is a fragmentary view of said lock in its fully unlocked condition.

Fig. 5 is an end view of the casing.

Fig. 6 is a front view of the casing showing the means included in this embodiment for swinging the arm upon movement of the bolt.

In the drawing, the numeral l5 indicates a casing adapted to be mounted on the inside surface of a door, having the slidable bolt l6, which lies wholly within the casing l5, when the lock is in its unlocked condition, and which can be partially slid out therefrom either by turning the knob ll, by hand at the inside surface of the door, or by key-controlled means indicated generally by the numeral 50 operative from the outside surface of the door, as is the usual construction of slidable bolt locks in everyday use. Extending horizontally from the casing I5, is a rotatably mounted pin l9, which terminates in a gear 20, at its end within the casing l5, which gear is in engagement with a rack 2|, secured lengthwise along the bolt I6, in the direction of the latters travel. An arm 22, at one end, is secured by a pin 23, onto the externally extending end of the pin I9.

The numeral 24 indicates generally a keeper adapted to be mounted on the jamb to receive the bolt 5 into chamber 25', whereupon the door is locked by such interconnection. Integral with this keeper 24, is a rest member designated by the numeral 25', which consists of a spacer end 26, having an arm 21 extending towards the door and spaced from the surface of the keeper 24. This arm terminates in an upright crotch 28, which is also spaced from the surface of the keeper, whereby the arm 22 and the fork 29 thereof, may pass between the keeper 24 and the rest member 25. The curved slot 30, and the vertex of the crotch 28, lie in the circumference of a circle having its center at the axis of pin l9.

One end of a chain 3|, linked to a bracket 32 mounted on the jamb, terminates at its free end in the central portion of an engagement piece 33, between a pair of reduced portions 34 and 35 in the latter. When the lock is in open condition, this engagement piece 33, sits with its reduced portion 34 in the vertex of the crotch 28, and the arm 22 hangs downward with its fork 29 entirely in front of the casing I5.

When the bolt I6 is moved by either of the methods mentioned to enter chamber 25 in keeper 24, the gear 20 will be turned due to its engagement with rack 2|, swinging arm 22 upward. The engagement piece 33 at its reduced portion 35, will be received in slot 30 of the fork 29, which now overlaps the jamb, and the arm 22, in its travel, will carry piece 33 at the free end of the chain 3i, along with it to its final position in which the arm 22 is upward, and its fork 29 in engagement with said piece 33 entirely in front of the casing I5, whereby a chain connection is effected between the door and its jamb and such interconnection maintained, while the 25 bolt I5 is within its keeper 24. This describes the closed condition of the lock, and its closing.

To-unlock the door, the bolt is moved by either of the methods mentioned to come entirely within its casing [5, whereby gear 20 will be turned in a direction opposite to that it was formerly given, swinging arm 22 downward across the face of the keeper to pass the region of the crotch 28. The engagement piece 33 is intercepted by the crotch 28 and remains seated thereon as in its initial position, while fork 29 recedes, disengaging itself from said piece 33, and comes back to its initial position with arm 22 hanging downward and again entirely in front of the casing l5. This sets forth the operation of opening the lock.

To those versed in the art, the construction of a lock following the teachings of this invention to effect only a chain interconnection between a door and its jamb, is evident, and that the movement of the arm 22, can be accomplished by a direct rotary motion imparted by the keyoperative means.

Once the lock is mounted on the door and jamb properly, the free end of the chain need never be touched, for it assumes its respective positions always automatically. I do provide however, that should a chain connected be desired by a person within a room, then the engagement piece 33 is taken from off the crotch 28, for engagement thereof in a T-channel 48 in member 49, integral and extending forward of the casing I5.

I claim:

1. In a lock for a door and its jamb, the combination of, a chain secured at one end to one of them, a pair of members, each adapted to admit and engage the free end of the chain, mounted on the door and jamb respectively, one fixed and the other pivoted; the free end of the chain being removably engaged in one of said members, and key-operative means adapted to be actuated from the outside surface of the door for swinging the pivoted member, whereby the free end of the chain is conveyed to leave the member it had first been in engagement with, and to enter and become engaged by the other of said members to effect or remove a chain connection between the door and jamb.

2. In a lock for a door and its jamb, the combination of, a chain-end receiving member pivotal- 1y mounted on the inside surface of the door, a chain-end rest member mounted on the jamb, a chain secured at one end to the jamb; the free end thereof being removably engaged in one of said members, and key-operative means adapted to be actuated from the outside surface of the door for swinging the chain-end receiving member past the region of the rest member, whereby the free end of the chain is intercepted and engaged by the other of said members and released from the member it had first been in engagement with, to effect or remove a chain connection between the door and jamb.

3. In a lock for a door and its jamb, the combination of, a crotch member mounted on the jamb, an arm member pivotally mounted on the inside surface of the door, terminating at its free end in a fork of curved spaced fingers; the vertex of the crotch and the centre-line between said fingers lying in the circumference of a circle with centre at the point of pivot of the said arm member, a chain secured at one end to the jamb; the free end thereof terminating in an engagement piece, adapted to rest at the vertex of the crotch and between said fingers, removably engaged in one of said members, and a key-operative means adapted to be actuated from the outside surface of the door for swinging the arm member for its forked end to pass the vertex of the crotch member, whereby the engagement piece is intercepted and engaged by the other of said members and released from the member it had first been in engagement with, to effect or remove a chain connection between the door and 'amb.

EUGENE P. BEAUMONT. 

